Growing community of inventors

Tewksbury, MA, United States of America

John P Silvia

Average Co-Inventor Count = 2.00

ph-index = 2

The patent ph-index is calculated by counting the number of publications for which an author has been cited by other authors at least that same number of times.

Forward Citations = 11

John P SilviaCharles M Willwerth (2 patents)John P SilviaJohn P Silvia (2 patents)Charles M WillwerthCharles M Willwerth (2 patents)
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Inventor’s number of patents
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Strength of working relationships

Company Filing History:

1. Compo Industries, Inc. (2 from 12 patents)


2 patents:

1. 4233012 - Bias stretching apparatus for imitation-leather

2. 4140827 - Imitation-leather, bias-stretching process

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12/30/2025
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